Abstract
The puzzles regarding the magnitude of the free electron mobility in hydrogenated amorphous silicon are examined. It is suggested that high-level double injection produces a metastable increase in the carrier mobility by neutralizing positively and negatively charged defect states thereby eliminating long-range potential fluctuations. Since these defect states cannot be neutralized under low-level or single injection, they both contribute to the modulation of the conduction band and increase the free-carrier scattering. If the latter is the predominant scattering mechanism, the neutralization of charged defects directly leads to a mobility increase under double-injection conditions. We discuss the various implications of this model, and present recent experimental results in agreement with these ideas.
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Silver, M., Adler, D., Shaw, M.P. et al. Electronic Transport in Hydrogenated Amorphous Silicon. MRS Online Proceedings Library 70, 119–124 (1986). https://doi.org/10.1557/PROC-70-119
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DOI: https://doi.org/10.1557/PROC-70-119